ci: Run a daily baseline benchmark of main for the cache

[larseggert]

The docker and python caches put quite a bit of stress on the GHA cache, causing it - for example - to time out the benchmark results too soon. See https://github.com/mozilla/neqo/actions/caches

This makes sure we should have a fresh baseline benchmark in the cache for comparison.

Simpler than #1769

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.09%. Comparing base (bb3ab60) to head (bf6b51a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1770   +/-   ##
=======================================
  Coverage   93.09%   93.09%           
=======================================
  Files         117      117           
  Lines       36404    36404           
=======================================
  Hits        33889    33889           
  Misses       2515     2515           

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[github-actions]

Benchmark results

Performance differences relative to bb3ab60.

• coalesce_acked_from_zero 1+1 entries
  time: [195.40 ns 195.81 ns 196.28 ns]
  change: [-0.7095% -0.3470% -0.0194%] (p = 0.05 > 0.05)
  No change in performance detected.

• coalesce_acked_from_zero 3+1 entries
  time: [235.78 ns 236.30 ns 236.87 ns]
  change: [-0.0453% +0.5634% +1.4457%] (p = 0.16 > 0.05)
  No change in performance detected.

• coalesce_acked_from_zero 10+1 entries
  time: [235.02 ns 236.00 ns 237.08 ns]
  change: [-0.7700% -0.2568% +0.2179%] (p = 0.32 > 0.05)
  No change in performance detected.

• coalesce_acked_from_zero 1000+1 entries
  time: [216.76 ns 216.94 ns 217.15 ns]
  change: [+0.3124% +1.0214% +1.6930%] (p = 0.00 < 0.05)
  Change within noise threshold.

• RxStreamOrderer::inbound_frame()
  time: [117.97 ms 118.04 ms 118.11 ms]
  change: [-0.4944% -0.4023% -0.3111%] (p = 0.00 < 0.05)
  Change within noise threshold.

• transfer/Run multiple transfers with varying seeds
  time: [117.58 ms 117.86 ms 118.12 ms]
  thrpt: [33.863 MiB/s 33.940 MiB/s 34.019 MiB/s]
  change:
  time: [-0.7026% -0.3848% -0.0561%] (p = 0.02 < 0.05)
  thrpt: [+0.0561% +0.3862% +0.7076%]
  Change within noise threshold.

• transfer/Run multiple transfers with the same seed
  time: [118.15 ms 118.32 ms 118.48 ms]
  thrpt: [33.760 MiB/s 33.808 MiB/s 33.856 MiB/s]
  change:
  time: [-0.5884% -0.3850% -0.1878%] (p = 0.00 < 0.05)
  thrpt: [+0.1881% +0.3865% +0.5919%]
  Change within noise threshold.

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